/Engine/Source/Editor/UnrealEd/Public/Toolkits/AssetEditorToolkit.h
Called when a toolkit requests the overlay widget to be removed.
virtual void RemoveViewportOverlayWidget ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > InViewportOverlayWidget )